remcos | 9b5ef79976dbfedbc2c85f57a905bdc408956be8e51cb04a76a4e5d353b575a2

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Iserver.exe

Windows security bypass 2 TTPs 1 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UACDisableNotify = "0"	Iserver.exe

XpertRAT
XpertRAT is a remote access trojan with various capabilities.
rat xpertrat

XpertRAT Core payload 1 IoCs

resource	yara_rule
behavioral2/memory/5028-64-0x0000000000400000-0x0000000000443000-memory.dmp	xpertrat

NirSoft MailPassView 4 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4944-40-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/4944-37-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/4944-45-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/3488-86-0x0000000000400000-0x000000000041B000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/3528-38-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3528-63-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/2548-87-0x0000000000400000-0x0000000000459000-memory.dmp	WebBrowserPassView

Nirsoft 10 IoCs

resource	yara_rule
behavioral2/memory/3528-38-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4944-40-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/4944-37-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/4944-45-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/4352-47-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4352-55-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3528-63-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3488-86-0x0000000000400000-0x000000000041B000-memory.dmp	Nirsoft
behavioral2/memory/2548-87-0x0000000000400000-0x0000000000459000-memory.dmp	Nirsoft
behavioral2/memory/3568-94-0x0000000000400000-0x0000000000415000-memory.dmp	Nirsoft

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2 = "C:\\Users\\Admin\\AppData\\Roaming\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2.exe"	iexplore.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	iexplore.exe

Executes dropped EXE 1 IoCs

pid	Process
464	Iserver.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1320-85-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/3000-93-0x0000000000400000-0x0000000000416000-memory.dmp	upx

Windows security modification 2 TTPs 1 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UACDisableNotify = "0"	Iserver.exe

Accesses Microsoft Outlook accounts 1 TTPs 2 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	iexplore.exe
Key opened	\REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Caspol.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3350690463-3549324357-1323838019-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2 = "C:\\Users\\Admin\\AppData\\Roaming\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2.exe"	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2 = "C:\\Users\\Admin\\AppData\\Roaming\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2.exe"	iexplore.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Iserver.exe

Suspicious use of SetThreadContext 10 IoCs

description	pid	Process	procid_target
PID 3812 set thread context of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 556 set thread context of 3528	556	Caspol.exe	91
PID 556 set thread context of 4944	556	Caspol.exe	92
PID 556 set thread context of 4352	556	Caspol.exe	94
PID 464 set thread context of 5028	464	Iserver.exe	99
PID 5028 set thread context of 1320	5028	iexplore.exe	102
PID 5028 set thread context of 3488	5028	iexplore.exe	103
PID 5028 set thread context of 2548	5028	iexplore.exe	104
PID 5028 set thread context of 3000	5028	iexplore.exe	105
PID 5028 set thread context of 3568	5028	iexplore.exe	106

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
3528	Caspol.exe
3528	Caspol.exe
4352	Caspol.exe
4352	Caspol.exe
3528	Caspol.exe
3528	Caspol.exe
464	Iserver.exe
464	Iserver.exe
464	Iserver.exe
1320	iexplore.exe
1320	iexplore.exe
464	Iserver.exe
2548	iexplore.exe
2548	iexplore.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
556	Caspol.exe
556	Caspol.exe
556	Caspol.exe
556	Caspol.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4352	Caspol.exe
Token: SeDebugPrivilege	5028	iexplore.exe
Token: SeDebugPrivilege	1320	iexplore.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
556	Caspol.exe
464	Iserver.exe
5028	iexplore.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 3812 wrote to memory of 556	3812	NEAS.00023eb2bebba3dfe0bf9497a742b890.exe	88
PID 556 wrote to memory of 3528	556	Caspol.exe	91
PID 556 wrote to memory of 3528	556	Caspol.exe	91
PID 556 wrote to memory of 3528	556	Caspol.exe	91
PID 556 wrote to memory of 3528	556	Caspol.exe	91
PID 556 wrote to memory of 4944	556	Caspol.exe	92
PID 556 wrote to memory of 4944	556	Caspol.exe	92
PID 556 wrote to memory of 4944	556	Caspol.exe	92
PID 556 wrote to memory of 4944	556	Caspol.exe	92
PID 556 wrote to memory of 492	556	Caspol.exe	93
PID 556 wrote to memory of 492	556	Caspol.exe	93
PID 556 wrote to memory of 492	556	Caspol.exe	93
PID 556 wrote to memory of 4352	556	Caspol.exe	94
PID 556 wrote to memory of 4352	556	Caspol.exe	94
PID 556 wrote to memory of 4352	556	Caspol.exe	94
PID 556 wrote to memory of 4352	556	Caspol.exe	94
PID 556 wrote to memory of 464	556	Caspol.exe	97
PID 556 wrote to memory of 464	556	Caspol.exe	97
PID 556 wrote to memory of 464	556	Caspol.exe	97
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 464 wrote to memory of 5028	464	Iserver.exe	99
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 1320	5028	iexplore.exe	102
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 3488	5028	iexplore.exe	103
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104
PID 5028 wrote to memory of 2548	5028	iexplore.exe	104

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Iserver.exe

C:\Users\Admin\AppData\Local\Temp\NEAS.00023eb2bebba3dfe0bf9497a742b890.exe
"C:\Users\Admin\AppData\Local\Temp\NEAS.00023eb2bebba3dfe0bf9497a742b890.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3812
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:556
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\tpnrxcnd"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:3528
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\ejtkxvyxdpu"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4944
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\omycynjyrxmejsn"
    3⤵
    PID:492
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\omycynjyrxmejsn"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4352
- - C:\Users\Admin\AppData\Local\Temp\Iserver.exe
    "C:\Users\Admin\AppData\Local\Temp\Iserver.exe"
    3⤵
    - UAC bypass
    - Windows security bypass
    - Executes dropped EXE
    - Windows security modification
    - Checks whether UAC is enabled
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    - System policy modification
    PID:464
  - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
      C:\Users\Admin\AppData\Local\Temp\Iserver.exe
      4⤵
      Adds policy Run key to start application
      Adds Run key to start application
      Suspicious use of SetThreadContext
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:5028
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        /stext "C:\Users\Admin\AppData\Roaming\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\vhbnmppaf0.txt"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1320
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        /stext "C:\Users\Admin\AppData\Roaming\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\vhbnmppaf1.txt"
        5⤵
        Accesses Microsoft Outlook accounts
        
        PID:3488
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        /stext "C:\Users\Admin\AppData\Roaming\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\vhbnmppaf2.txt"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        
        PID:2548
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        /stext "C:\Users\Admin\AppData\Roaming\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\vhbnmppaf3.txt"
        5⤵
        
        PID:3000
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        /stext "C:\Users\Admin\AppData\Roaming\U1B5S2E0-S6R4-Y4O1-P7F0-W443P1Y6S3M2\vhbnmppaf4.txt"
        5⤵
        
        PID:3568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry